[1986c10]

well my thinking is with like a block lift, the stock pinion angle is retained because the axle is not moved any direction but farther below the springs and is not tilted any direction, just lowered so the 3 degree range between output shaft and pinion angle would be kept true. in a shackle flip setup, the eyehook of the rear part of the leafspring is lowered by 5-6" and id think that the lowering of only the rear would make the perches of the axles sit at a much different angle then stock... You probably are correct as many companies make this lift with no problems, i just wanna make sure before i dive into anything